Vitamin D deficiency climbs from 7.5% at 6 months to 13.6% at 12 (Butsch et al., 2025), and ferritin runs 2630% below comparison groups (Urbina et al., Clinical Obesity 2026)
Traditionally associated with supporting healthy body composition, contributing to normal fat metabolism, and promoting lean body mass maintenance as part of an active lifestyle and balanced dietary routine
Most runners experience noticeable improvement by mid-second week
trials like SUMMIT explore biomarkers
Neurological conditions lead to greater than 7 million deaths on an annual basis and result in 435 million disability-adjusted life years
Habitual dietary fiber intake influences gut microbiota response to an insulin-type fructan prebiotic: a randomized, double-blind, placebo-controlled, crossover, human intervention study